Feedback step only recognizes EndEvent

[danielskovli]

Description of the bug

Since version 4.18.5 of the app-frontend-react code, an app with a feedback step does not correctly move on to the next task unless that task is an EndEvent.

Example of bpmn flow that causes the issue: https://altinn.studio/repos/ttd/fiks-arkiv-test/src/branch/master/App/config/process/process.bpmn

The user has a data task where information is collected, then the app enters a feedback step. During the feedback step an async process is executed, and depending on the result the user is either taken to the receipt page, or to an error page.

This gateway pattern works is intended, but the frontend code does not properly understand it, and the user gets stuck:

Steps To Reproduce

1. Set up a success/error gateway flow after a feedback task (as illustrated here)
2. Trigger an error pathway

Additional Information

No response